import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

import numpy as np

N = int(readline())
A = np.array(read().split(),np.int64)

A.sort()
x = np.arange(1,N+1) - A

answer = np.abs(x).sum()
print(answer)